Pump-controlling means



Nov. 30 1926. i' 1,608,589

G. w. ENGSTROM PUMP CONTROLLING MEANS Filed Jun 8', 1922 :Eni i sii thefloat lever 15.

Patented Nov. 30, 1926.

UNITEDSTATES PATENT OFFICE.l

GUSTAF W. ENGSTROM, F RIVERSIDE, ILLINOIS, ASSIGNOR TO INTERNATIONALHAR- VESTER COMPANY, OF CHICAGO, ILLINOIS. A CORIORATION 0F NEW JERSEY.

PUMP-CONTROLLING MEANS.

Application led June 8,

My invention relates to a control device for t'ecd pumps andparticularly to a means for controlling the intake valve.

The feed pumps used in automotive steam power plants are usually singlestage pumps which draw water from a ot well or direct from a condenserand deliver it to I from drawing in air when the supply of water fallsbelow a predetermined level.

In the drawings, I have illustrated an embodiment of my inventionadapted to attain the object sought.

Fig. 1 is a vertical section of the pump and control means taken on theline 1 1 of Fig. 2;

Fig. 2 is a plan of Fig. 1;

Fig. 3 is a section of the pump taken on the line 8-3 of Fig. 2; and

. Fig. 4 is a section on line 4-4 of Fig. 1 showing the valve tripmechanism.

In Fig. 1 I have shown a float chamber or reservoir having a body 10closed by cover 11 into which the pipe 12 leading from a condenserdischarges. The cover is also provided with a relief valve 13 throughwhich steam 4from the con-denser or air trapped in the float chamber`mayescape. In the bottom of the float chamber there is secured a support14to which one end of a ioat lever 15 is pivotally connected, the otherend of the lever being connected to a oat lhaving a stem 17 extendingupward Vinto the guide 18 secured to the cover. The trip lever 19 ispivoted intermediate its ends to the standard 14 and at one end has twolaterally projecting lugs 20, 21 to which. one end of each of thesprings 22, 23'is connected, the opposite ends of the springs beingconnected to similar lugs 24, 25 on The other end of the lever 19engages a plunger 26 slidably mounted in a guide in the body of thereservoir. -The cylinder 27 ofthe feed pump has an intake Jpassage 28ycontrolled by a valve A29 and a discharge passage 30 controlled by asimilar valve 31, the cylinder y being secured to the body of thereservoir with the intake passage 'in communication 1922. Serial No.566.919.

therewith. The )iston 32 recprocates in the bore of thc ey indell and isconnected to a ICrosshead 32 which is reciprocated by the connecting rod38. A stulling box 34 prevents leakage ot' water past the iston 32. Inthe operation of my device,` tie pump is driven from the engine andwater from the condenser enters the float chamber through the passage12. the pump drawing its supply through the inlet passage 28 anddischarging it through the outlet and pipe 35 leading to the boiler.Assume now that 'the reservoir contains enough water so that the float16 is raised and the plunger 26 lowered so as to permit the valve 29 tos eat.` The pump then supplies water to the boiler as long as the supplyof water entering the float chamber through the pipe 12 is sufficient tokeep the float 16 raised and let the valve 29 seat. But, it the pump,for any reason, delivers water faster than it is supplied through thepipe 12, the float will drop with the water lever until a point isreached at which the springs 22 and 23 pass below the pivotalconnections of the levers 15 and 19 when the tree end of a lever 19 will-be suddenly thrown upward against the plunger 26 and `hold the valve 29 from its seat. As the pump now continues to operate, it will draw in,-water through the passage 28 on its intake stroke and on its deliverystroke will force the water back through the passage 28 into the ioatchamber. This operation continues until suii'cient water accumulates inthe reser- J voir to elevate the float until the springs 22 and 23 pass.above the pivotal connections of the levers when the free end of the'lever 19 will' be thrown down against the stop 36 `and permit the inletvalve to seat, after whichthe pump will again discharge through the pipe35.

It will be apparent to those skilled in the art that I have provided adevice which l absolutely prevents the feed pump from drawing in airwhenthe water supply fails` sincethe trip mechanism will be operatel andthe inlet valve held open before the water lever falls to such a pointthat the pump may drawfin air. v

Vhile I have described an embodiment; of my inventionA in which thevalve controlling means is floatactuated, it is to be understood that Iam not to be limited to the exact mechanism shown but claim as voirhaving'l my invention anyv equivalent means that may fall Within thescope of my claims.

What I claim as neu7 and desire to secure by Letters Patent is:

l.- In a device of the class described, the combination of a pump havingvalve controlled intake and discharge passages, a fluid reservoirconnected to the intake passage, and means for holding the intake valveopen when the Huid in the reservoir falls to a predetermined level.

2. In a liquid circulating system,` the combination of a casingconstituting a resera supply opening, a pump mounted on the casinghaving intake and discharge passages with a valve controlling ach ofsaid passages, the intake passage coml municating with the casing, and afloat and plying water thereto, a pump having an v valve control meansoperable thereby mounted in the casing for controlling the intake valvevand passage to prevent the discharge of liquid through 4the dischargevalve of the pump when the liquid in the reservoirfalls to apredetermined level.

3. In a device of the class described, the combination of a pump havingintake and discharge passages, valves controlling the respectivepassages, a reservoir from which the pump receives its supply connectedto the intake passage, means for'supplyin fluid to the reservoir. andmeans controlle by the level of the fluid in the reservoir for holdingthe intake valve open when the fluid falls to a predetermined level.

4. In a device of the class described, the combination of a pumpclyinder having valve controlled intake and discharge passages, areceiver connected to the pump cylinder in communication With the intakepassage, a float in the receiver, r,means for supplying'liquid thereto,and means operatively connecting the float and intake valve Whereby thevalve may close when the liquid is above a predetermined level and isheld open by the float When the liquidis below a pre.

determined level. l

5. In a device of the class described, the combination of apump havingintake and Idischarge passages, valves controlling the re-v spectivepassages, a reservoirI connected to the inlet passage, a. lloat inthe'reservoir adapted to rise and fall with the level of the liquidtherein, means for supplying liquid to the reservoir, and means`actuated by the float to hold the intake valve from its seat when theoat falls below a predetermined level and to permit the ,valve to-seatWhenV the `float rises above another predetermined4 level. 1 i

6. In a'pump controlling device, the combination of a water reservoir,means for supot the lever. a second lever pivoted interme- 75 diate itsends to the support, a valve actuating plunger adapted to engage one endof the second'lever, and resilient means connecting the. other end ofthe second lever to the first named lever intermediate its ends. 8U.

system for In a water circulating steam power plants, the colnbinationof a reservoir, means for supplying water to said reservoir,means forpumping water from the reservoir to a boiler in the system, and 'S5means for causinflr the pump to return Water to the reservoir w ien theWater supply means for the reservoir fails.

9. In a Water circulating system for steam power plants, the combinationof a reser- "l voir, an inlet for supplying Water to the rescrvolr, apump for taklng Water out of the reservoir, and means for causing saidpump to return water to the reservoir when the supply therein diminishesto a predeter- 95` mined level.

l0. In a water circulating system, the combination of a supplyreservoir, means for feeding Water to the reservoir, means for pumpingwater therefrom, and automatical- 100 said pumping ly acting means forcausing means to`return water to the reservoir when the supply thereinbecomes diminished a predetermined point. I

1l. In a Water circulating system, the com- 105\"\fbination ofv a supplyreservoir, means for feeding Water to the reservoir, a pump for takingwater from the reservoir, and means in thereservoir for automaticallycontrolling y the pump to cause it to return supply reservoir when theamount of water contained therein diminishes to a predetermined point. v

12. In a Water circulating system, the combination of a supplyreservo1r,":a constantly 15 acting pump for taking water from'thereservoir, and means for controlling said pump to cause it to returnWater to the reservoir when the supply therein diminishes to a pre'-determined extent.

In testimony WhereofI atiix my signature.

GUSTAF- W. ENGSTROM.

the 65 water to the U"

